const references in C++ and D

[bearophile]

Steven Schveighoffer:
> D's solution is to use auto ref, but I think your attempts to use it show  
> that it doesn't work.  You should file a bug with your program 3.

Thank you for your always useful explanations, Steven (this is a fragile bug report, if you change the code a bit the bug vanishes).
http://d.puremagic.com/issues/show_bug.cgi?id=4258

Bye,
bearophile